I have a database of users purchase/sell of stocks and need to retrieve the data by summing all the shares for that specific user.
Ex: If I choose user_id = 7, it should return two rows, one with TESLA and one with Apple with the sums of the shares.
Database:
SQL queries I've tried include:
SELECT name,symbol,name,price,total, SUM(shares)
FROM symbol
WHERE user_id=7
GROUP BY name,symbol,name,price,total
Returns: but it should just be two rows
Your issue is your grouping.
Consider the uniqueness of what you are grouping by and that is how many rows you will get returned.
With your where clause and grouping by name,symbol,name,price,total there are three unique rows.
Remove the price and total columns from the grouping and you will get your desired two rows, or include them in your query as sum'd columns.
eg.
SELECT name,symbol,name,SUM(shares)
FROM symbol
WHERE user_id=7
GROUP BY name,symbol,name
Related
I use knexjs and postgresql. Is it possible in knexjs to get the total of records from the same query in which the limit is used?
For example:
knex.select().from('project').limit(50)
Is it possible to somehow get the total number of records in the same query if there are more than 50?
The question arose due to the fact that my query is much more complex, which uses a lot of subqueries and conditions, and I would not like to make this query twice to get the data in one query and the total number of records (I use the .count() method) from another.
I do not know your obscurification manager (knexjs?) but I would think you should be able to add the window version of the count() function to your select list. In plain SQL something like: Where ... represents your current select list. (see demo)
select ..., count(*) over() total_rows
from project
limit 5;
This works because the window count function counts all rows selected, after all rows selected, but before the LIMIT clause is applied. Note: This adds a column to the result set with the same value in every row.
My SQL query needs to return data grouped by requirement. To do so, it needs to group by more than one column.
Example SQL:
SELECT
[MainMenu],
[Submenu1],
[Submenu2],
[Submenu3],
[Submenu4],
[Submenu5],
[Submenu6],
[Submenu7],
Sum([MainMenuReturn]) AS "Total Returns",
[ExitReason]
FROM [dbo].[Custom_IVRMenuUsage]
GROUP BY MainMenu,Submenu1,Submenu2,Submenu3,Submenu4,Submenu5,Submenu6,Submenu7,ExitReason
This will return each combination of the groupings and keep the column separated data. I cannot do this in Crystal. If I concatenate the columns into one field to group by, I lose the ability to keep the data separated into their columns for formatting.
How can I accomplish this in Crystal without writing a separate stored procedure?
How can I create a DAX query that retrieves rows from a given range in that order. Let's say I want the rows from row 1000 to row 2000. There is no unique id in my database. Should I add one, or is it possible without it?
If you can't distinguish a filter to create the subset of rows you are targeting then I would use a unique ID. I have not come across anything in DAX that allows to select rows in your powerpivot data set. If there isn't anything unique about the data you are targeting then I imagine you would need a unique ID.
i.e. I normally have column values I can filter with to target or create the subset of data I want to use.
I hope I am wrong and there is a way and look forward to someone posting a way.
I'm working in Pentaho 4.4.1-GA (Kettle / PDI). The database is Postgres.
I need to be able to insert multiple records into a fact table based on the fields that come from a single record. The single record contains fields:
productcode1, price1
productcode2, price2
productcode3, price3
...
productcode10,price10
So if there was a value for each of the 10 productcode / prices then I'd need to insert a total of 10 records into the fact table. If there were values for 4 of the combinations, then I'd need to insert 4 records into the fact table, etcetera. All field values for the fact records would be identical except for the PK (generated by sequence), product codes, and prices.
I figure that I need some type of looping construct which would let me check whether or not a value was present for each productx field, and if so, do an insert/update step on the fact table with the desired field values. I'm just not sure how to do this in Pentaho.
Any ideas? All suggestions are welcome :)
Thank You,
Rakesh
Could you give a sample input and output for your scenario??
From your example data I can infer that if there are 10 different product codes and only 4 product prices you want to have 4 records inserted into your table. Is that so?
Well for a start you can add a constant value of 1 to those records by filtering for NOT NULL and then use an Group BY Step to count the number of 1's. This would give you the count. BTW it would be helpful if you could provide more details on what columns you would be loading as there are ways to make a PDI transformation execute multiple times
I am using Crystal Reports Developer Studio to create a report that reports on two different tables, let them be "ATable" and "BTable". For my simplest task, I would like to report the count of each table by using Total Running Fields. I created one for ATable (Called ATableTRF) and when I post it on my report this is what happens:
1) The SQL Query (Show SQL Query) shows:
SELECT "ATABLE"."ATABLE_KEY"
FROM "DB"."ATABLE" "ATABLE"
2) The total records read is the number of records in ATable.
3) The number I get is correct (total records in ATable).
Same goes for BTableTRF, if I remove ATableTRF I get:
1) The SQL Query (Show SQL Query) shows:
SELECT "BTABLE"."BTABLE_KEY"
FROM "DB"."BTABLE" "BTABLE"
2) The total records read is the number of records in BTable.
3) The number I get is correct (total records in BTable).
The problems starts when I just put both fields on the reports. What happens then is that I get the two queries one after another (since the tables are not linked in crystal reports):
SELECT "ATABLE"."ATABLE_KEY"
FROM "DB"."ATABLE" "ATABLE"
SELECT "BTABLE"."BTABLE_KEY"
FROM "DB"."BTABLE" "BTABLE"
And the number of record read is far larger than each of the tables - it doesn't stop. I would verify it's count(ATable)xcount(BTable) but that would exceed my computer's limitation (probably - one is around 300k rows the other around 900k rows).
I would just like to report the count of the two tables. No interaction is needed - but crystal somehow enforces an interaction.
Can anyone help with that?
Thanks!
Unless there is some join describing the two tables' relationship, then the result will be a Cartesian product. Try just using two subqueries, either via a SQL Command or as individual SQL expressions, to get the row counts. Ex:
select count(distinct ATABLE_KEY) from ATABLE
If you're not interested in anything else in these tables aside from the row counts, then there's no reason to bring all those rows into Crystal - better to do the heavy lifting on the RDBMS.
You could UNION the two queries. This would give you one record set containing rows from each query once.